As a biographical note I spent
nearly 10 years in the Sea Org from 1972 - 1982. I repaired E-meters on
board the Apollo and at the FLB. I trained as an auditor up to Cl V at
the FLB and have since audited many thousand hours at NOTs level on self
and others.

The Mk V E-Meter as originally
used in the CofS suffers from several major faults. The major trouble is
that it is insufficiently sensitive to pick up reads on OT level 5 and
above. At the higher levels one is often dealing with small reads sometimes
through a fast moving needle.

The CofS attempted to produce
a better meter in the Mk VI. While the quality of some parts was improved
the essential circuit was very similar to the Mk V. The major change was
in the meter movement. My own tests indicate that the Mk VI is actually
less sensitive than the Mk V. The Mark VII is a much improved product that
uses a superior quality of movement and picks up many more reads. Unfortunately
the CofS appears to have an arbitrary in the design spec. The Mk VII movement,
in common with earlier models does not come to rest after a read for several
seconds. It actually swings 8-10 times before settling. This uncontrolled
movement can obscure and confuse reads. I have recently had a meter movement
produced that does not swing about after a read. An increased torque in
the coil produces a faster needle response to changes in the pc. Using
a device that I built a pc can be connected to 2 meters simultaneously.
Comparisons using it show reads on the improved design not present on any
CofS meter.

I have written up data on
the E-Meter with full circuitry and specification: E-Meter
Circuit